Affiliations: Department of Computer Science and Technology, Xi'an
Jiaotong University, Xi'an, China | Department of Computer Science and Engineering,
Shanghai Jiaotong University, Shanghai, China | Department of Science and Technology, Linköping
University, Linköping, Sweden
Note: [] Corresponding author: Xingjun Zhang, Department of Computer
Science and Technology, Xi'an Jiaotong University, Xi'an, China. E-mail:
xjzhang@mail.xjtu.edu.cn
Abstract: In this paper a novel unequal packet loss protection scheme R2NC
based on low-triangular global coding matrix with ladder-shaped partition is
presented, which combines redundant and random network coding for robust
H.264/SVC video transmission. Firstly, the error-correcting capabilities of
redundant network coding make our scheme resilient to loss. Secondly, the
implementation of random network coding at the intermediate nodes with multiple
input links can reduce the cost of network bandwidth, thus reducing the
end-to-end delay for video transmission. Thirdly, the low-triangular global
coding matrix with ladder-shaped partition is maintained throughout the
R2NC processes to reduce the impact of global coding matrix's rank
deficiency on video transmission and provide unequal erasure protection for
H.264/SVC priority layers. The redundant network coding avoids the
retransmission of lost packets and improves error-correcting capabilities of
lost packets. Based only on the knowledge of the packet loss rates on the
output links, the source node and intermediate nodes can make decisions for
redundant network coding and random network coding (i.e., how much redundancy
to add at this node). However, the redundancy caused by redundant network
coding makes the network load increases. In order to improve network
throughput, we performed random network coding at the intermediate nodes. Our
approach is grounded on the overall distortion of reconstructed video
minimization by optimizing the amount of redundancy assigned to each layer. The
convex optimization model is constructed under the constraint of network coding
and scalable video coding. Experimental results are shown to demonstrate the
significant improvement of H.264/SVC video reconstruction quality with R2NC
over packet lossy networks.
Keywords: Network coding, scalable video coding, low-triangular global coding matrix with ladder-shaped
partition, unequal error protection
